2007-03-18 15:22:36 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Matter is energy, so is light, the food you eat, the heat that keeps you warm etc.
The law of conservation of energy states that energy can not be created (made from nothing), or destroyed (made to disappear to no-where) and that energy can be changed from one form to another (such as electrical energy in to heat energy).
Energy can be kinetic ( mass with a velocity ) or potentia (mass at rest ):
All mass ( matter ) has energy in it, an example of the difference between potential energy versus kinetic energy is easy to reproduce.
Experiment: Take a billiard ball and hold it in your hand, its speed is zero because you are holding it, so its energy is potential, if you throw the ball against a window, the energy of your arm is transferred to the ball, now the ball has a velocity over zero and has kinetic energy:
Proof: the window brakes!
Work has been done...
*Do not try this at home;)
2007-03-18 15:37:39 · answer #1 · answered by Yahoo! 5 · 1⤊ 0⤋
Energy, definition is simply "The Ability to do Work".
It cannot be created nor destroyed but, can be converted into other forms .. Potential energy to Kinetic energy; and to Mechanical, Electrical, Heat, Light, Pressure, ..etc.
'Work' is the result of the application of Force.
Work done = Force x Distance an object moves.
In SI units, work done is in 'Joules' or 'Kilo-Joules' (J or kJ).
In Imperial units, it is 'Foot-pounds' (ft-lb).
1 Joule is 'The work done when a force of 1N moves an object a distance of 1m (in the directionof the force)'.
1 ft-lb is 'The work done when a force of 1lb moves an object a distance of 1ft (in the direction of the force'.
2007-03-18 22:32:50 · answer #2 · answered by Norrie 7 · 0⤊ 0⤋
Energy is a fundamental concept of physics, with applications throughout the natural sciences.
Energy is subject to a strict global conservation law; that is, it can neither be created nor destroyed. Most kinds of energy (with gravitational energy being a notable exception)are also subject to strict local conservation laws, as well.
2007-03-18 22:36:42 · answer #3 · answered by holla 2 · 0⤊ 0⤋
"Ability to do work"? But the physical dimensions of work is energy, so that's the same as saying, "Energy is ability to do energy". Not real helpful.
2007-03-18 22:39:47 · answer #4 · answered by Scythian1950 7 · 0⤊ 0⤋
Energy is the ability to do work.
2007-03-18 22:44:49 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Simple definition: the ability to do work.
2007-03-18 22:27:09 · answer #6 · answered by ecolink 7 · 0⤊ 0⤋
the ability to do work.
2007-03-18 22:44:51 · answer #7 · answered by deeptisharma92 2 · 0⤊ 0⤋